Determine elements in both two sets : set_intersection « STL Algorithms Merge « C++ Tutorial

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C++ Tutorial » STL Algorithms Merge » set_intersection 
28.5.3.Determine elements in both two sets
#include <iostream>
using std::cout;
using std::endl;

#include <algorithm>
#include <iterator>

int main()
{
   const int SIZE1 = 10, SIZE2 = 5, SIZE3 = 20;
   int a1SIZE1 12345678910 };
   int a2SIZE2 4567};
   int a3SIZE2 4561115 };
   std::ostream_iterator< int > outputcout, " " );

   std::copya1, a1 + SIZE1, output );
   cout << "\n";
   std::copya2, a2 + SIZE2, output );
   cout << "\n";
   std::copya3, a3 + SIZE2, output );

   int intersectionSIZE1 ];

   int * ptr = std::set_intersectiona1, a1 + SIZE1, a2, a2 + SIZE2, intersection );
   cout << "nset_intersection of a1 and a2 is: ";
   std::copyintersection, ptr, output );
      
   return 0;
}
1 2 3 4 5 6 7 8 9 10
4 5 6 7 8
4 5 6 11 15 nset_intersection of a1 and a2 is: 4 5 6 7 8
28.5.set_intersection
28.5.1.Illustrate set_intersection
28.5.2.Intersect the ranges by using set_intersection()
28.5.3.Determine elements in both two sets
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